Apparatus for treating coals and other hydrocarbonaceous susbstances.



J. n. SCOTT. APPARMUSTORTREATIWS COALS AND-OTHER HYBROCARBONACEOUS SUBSTANCES.

AFI LICATIDN FILED OCT. 23. I914. ML m ma Sept. 12,1916.

4 SHEETS-SHEET 1.

J. D. SCOTT. APPARATUS FOR TREATING COALS AND OTHER HYDRCCARBONACEOUS SUBSTANCES.

APPLICATION FILED OCT. 23. 1914.

' Patented Sept. 12, 1916.

4 SHEETS-SHEET 2.

J. D. SCOTT.

APPARATUS FOR TREATING CQALS AND OTHER HYDROCARBONACEOUS SUBSTANCES. APPLICATION FILED 06123, I9I4.

Immw.

4 SHEETS-SHEET 3- Patented Sept. 12, 1916.

J. D. SCOTT. APPARATUS FOR TREATiNG GOALS AND OTHER HYDROCARBONACEOUS SUBSTANCES.

APPLICATION FILED OCT. 23' 1914.

Patented Sept. 12, 1916.

4'SHEET$SHEET 4.

some punter scour, or nnraorr, MICHIGAN.

APPMATUS FGlQTELEATING GOALS AND OTHER HYDRGGARBONACEO'US SUBSTANCES.

arisen co.

Specification of Letters Patent. Patented Sept, 123, ll llfi.

Original application filed August 26, 15310, Serial K69 579319. Divided and this application filedv tlctobcr Y I se tum. Serial no. 868,241.

To all whom it may concern Be it known-.that.l,.lonn Dunner Soon, a citizen of the .Ilnited States, residin at Detroit, in the county of Wayne and tate of Michigan, have invented certain new and useful. Improvements in Apparatus for Treating Goals and other Hydrocarbons.- ceous Substances, of which the following is a specification. 4 1

This invention relates to apparatus for treating coals and other hydrocarbonaceous substances so that a portion of their constituents may be converted into volatile hydrocarbonaceous oils, and such hydrocarbonaceous substances which yield when subjected to heat at certain temperatures vapors of heavy oils, waxes naphthas, phenols and other products, and at higher temperatures yield tar, naphthalene, benzol, sulfur and other products of a more or less gaseous nature, and the object of the invention is to provide an improved apparatus so as to obtain by the treatment of these substances the maximum amount of the products which are thrown oiiat the lower temperatures without dissociating the initial products or producing any, or but aminimum quantity of gaseous products; also to prevent the destruction by combustion of the residual coke produced by the treatment of cannel and other coals; also to promote the rapid, continuous, uniform, and practi cally simultaneous treatment or eduction of the entire charge of these substances; also to extract the volatile products of coals, shales and lignites and other hydrocarbons.-

; ceous substances by bringing into contact therewith a dcoxidized gas and causing the same to pass therethrough and thus effect a. thorough extraction of those products from the substances and greatly reduce the time required for educing or converting the charge into volatile hydrocarbonaceous oils,

also to insure an uninterrupted movement of the heat currents through and out of the eduction chamber and their thorough and intimate contact with the coal or other charge therein; also to prevent the interruption of the movements of the heat currentsand also to promote'the rapid efilux of the vapors from the charge treating or eduction chamber and by carrying them away from the inflowing heat as rapidly as they are thrown off, prevent the formation or dissgciation of gaseous products.

ject of the present improvement is the provision of an improved apparatus by means of which the eduction chamber may be rapidly re-charged and discharged Without lowering the temperature thereof to such an extent as to prevent the rapid treatment of 5 each subsequentcharge. v

A further object of the invention is the provision of an improved arrangement of doors for separating the chambers.

A further object of the invention is the provision of improved means for raising and lowering the doors of the several chamhers, r

In .the drawings accompanying and form ing part of this specification Figure 1 is a perspective elevation of the eduction chain-- her with portions-thereof broken away; Fig. 2 is a longitudinal sectional view through said chamber, and also illustrates portions of the preliminary or reception chamber and of the final or cooling chamber; Fig. 3 is a plan view of the apparatus and of the foun-' dation adjacent thereto; Fig. 4 is a perspective dia rammatic View of this improved apparatus; and Fig. 5. is a detail View of the 35 means for raising and lowering the doors."

Similar characters of reference indicate corresponding parts in the difl'erent figures a of the drawings.

In thisimproved apparatus the substance to be treated, cannel coal or shale for example, is placed in trays supported by a suitable carrier or casing open at the bottom and top, but tightly closed at the sides, and at the ends by doors, and which carrier is inclosed in a chamber from which the air is excluded. In connection with this tray" carrier or casing a heat producing apparatus is employed in such a manner that the products of combustion, such as a deoxidized or neutral gas, produced in the present instance by gas flame, will act directly on the sides of the tray carrier and also lie-carried into the carrier at the top thereofand down I through the charge supported by the several 1 trays, and thus be caused to impinge upon the coal or shale in the trays by passing over and through such trays. .3 This tray'carrier or casing connects directly or indirectly with. suitable means foieither forcing drawing the vapors through a suitable connecting pipe into a condenser. .In the present instance this means is shown as a fan or exhauster. The charge of coal or shale is placed in the casing of the eduction chamber and divided into a plurality of layers supported in such manner that the heat currents may readily pass down through the several layers from one to another.

In the present apparatus the gas flame used for producing the heat is brought in direct contact with the side walls of the tray carrier, thus doing away with the use of fires and fire chambers entirely separated from the carrier. The temperature within the eduction chamber is restrained or kept below the point where inoandescence or red heat occurs, and usually varies between about 250 degrees F., at which temperature the eduction or conversion of the charge commences, and about 700 degrees F., at

p which temperature the complete separation of the volatile hydrocarbonaceous oils isusually obtained. -When the temperature has reached about .250 degrees F., the exhauster is started and driven at such speed as to effectively draw the deoxidized gas into the tray carrier at the top thereof and downward through the several trays and, thus 'over and througlr, the bodies of coal, whereby such deoxidize'd gas is caused to impinge upon the coal and thus-convert or educe therefrom the vapors, which as they develop join with such heat currents and .arecaused to flow with them out of the i. vapors are swept rapidly away from points where they develop andout of the eduction chamber and away-from the incoming heat before dissociation can take place, by the free rapidly moving heat currents with which they mingle.

It will be observed that in the present apparatus the heat to which the charge is subjected is largely dueto direct heat on the sides of the inner or removable chamber or tray carrier, so that the combustion gases merely tend to sweep away'the oil vapors thus formed and give a direction to the currents of those oil vapors, whereas heretofore the heat was solely obtained from the high temperature combustion gases. Furthermore, the zigzag passing of the heated gases in the apparatus heretofore used tended to cool those gases, so that by the time theyreached the bottom trays the eduction caused by them was very imperfeet and the coke on the bottom trays was found to contain very much more volatile matter than the coke on the upper trays, but by ,means of the present apparatus, whereby the deoxidized gas passes not only over and under the trays, but also transversely through the charge, whether in the top or the bottom tray, every part of the charge is completely treated, so that substantially the same volatile matter is obtained-from the lower trays as from the upper. y

The apparatus shown herein for the' treatment or eduction of the hydrocarbonaceous substances consists of an eduction chamber 2 having in front thereof and connected thereto a preliminary heating chamber 3, which in practice is preferably provided with an auxiliary heating apparatus by means of which the charge may be heated up preparatory to the conveyance thereof into the eduction chamber, whereby when carried into the latter chamber the charge will be more quickly heated and the volatile hydrocarbonaceous material extracted therefrom in a more rapid manner, thus materially reducing the time necessary for carrying out this improved process. Atthe rear of and connected with the eduction chamber is a cooling chamber 4, these chamhers being separated from each other by suitable doors 5 and 6. This cooling chamber 4 permits the cycle of operations to go on continuously without the necessity of leaving the tray carrier in the eduction chamber for the purpose of being cooled,

which would of course necessitate a grad- 3 the ignition of the charge, which would immediately take place if the charge were brought into the open air instead of in the coolingchamber, thus destroying the re sldual coke and seriously impairing the efficiency of the process. By this system of chambers, it will be observed that the eduction chamber 2 is always in condition for the reception of a new carrier containmg a charge of material to be treated, and

in the present improvement it will also be observed that this charge, when conveyed 3 into the eduction chamber has already been heated to a predetermined temperature, so that in consequence the time required to completely treat or educe the charge in the eduction chamber is very much lessened, as

well as better results obtained. These chambers;are preferably formed by suitable masonry or concrete, .and of a suitable size to receive a considerable number of trays.

As the tray carrier and trays herein shown, and the means for manipulating the same, constitute the subject-matter of a contemporaneously pending also a division of the application hereinbefore referred to, only a brief description thereof is deemed necessary herein.

1 The tray carrier 7 is shown herein made up of l-beams 8, the flanges of which are suitably bolted together, thus forming a pair of side walls 9 and 10, the inner flanges 11 projecting into the chamber of the carrier constituting the supports for the trays. The bottom walls of the chambers 2, 3 and 4- are provided with suitable supporting rollers by means of which the carrier is readily run from one chamber into the other. The side walls of the chambers are also provided with rollers adapted to engage the sides, as for instance a pair of exterior flanges of the carrier, thereby to prevent sidewise play or lateral movement of the carrier and also to facilitate the shifting of the carrier.

Within the eduction chamber 2, and at the sides of the carrier chamber there are located gas pipes 15, one at each. side of the carrier, having a series'of jets such as Bunsen burners extending along the carrier throughout the length thereof adjacent to the bottom, and by meansiof which the heat for the conversion of the charge is obtained,

' the spaces between the sides of the carrier and the inner walls of the eduction chamber constituting dues or heat passages by means of which the deoxidized gas is drawn upward and over the topof the carrier. The preliminary heating chamber is also provided with similarly arranged gas jets 15 which. are, however, located at somewhat greater distances apart than are those in the eduction chamber, this for the purpose of providing a less degree of heat in the preliminary heating chamber, so that the eduction or separation of the volatile hydrocarbonaceous material will not actually commence until the carrier has been shifted into the eduction chamber. These gas pipes'are connected bylsuitable conduits 16 leading to a suitable source of supply.

The tray carrier is provided at each end with a door 17 hinged thereto and having a su table catch for tightly clampingjt in position. The trays 19 are preferably forrhed of angle iron having suitable braces 20 supporting a perforated or reticulated bottom 21, shown herein as formed of wire mesh, by means of which the heated products of combustionor deoxidized gas may be drawn not only over but downwardly through the charge carried by the trays and thus from one tray to another from top to bottom mes es application,

,thereof. The side walls of the carrier are suitably connected together by connecting members or bars detachable to permit theshown the necessity of arranging them in a zigzag formation is obviated, with the resultthat instead of the heated gases becomf ing cool by the time they reach the bottom' of the trays, as heretofore, which resulted in an imperfect eduction so that the coke on the bottom trays contained muoh more volatile matter than that on the upper trays, a much more perfect eduction of all of the charge is not only obtained, but a more perfect eduction of the charge on the lower trays is the result, practical demonstration disclosingthat by this improved apparatus a larger amount of volatile hydrocarbonaceous oils is obtained/ The doors 5 and 6, together with the door closingthe front of the chamber 3, and a similar door, not shown, for closing the rear end of the chamber 4, are sliding doors mounted in suitable ways-and attached to cables 27, one for each door, the manipulation of each of which cables and its door is controlled by an independent mechanism, whereby the door may be raised and lowered at the proper time. As the means for operating each of these doors is shown as the same, a description of oneof them will suffice.

Supported on top of the masonry forming theseveral chambers. is the operating mechanism for each of the doors. This con sists of a grooved cable wheel or drum 28 around which the door supporting cable is wound. This drum is supported on a shaft 29 to which is also rigidly connected a worm. wheel 30 in mesh with a worm 31 carrying at its other end a bevel gear 32 in mesh with a pair of bevel gears 33' and 34 loosely mounted on a shaft 35 having at one end a driving wheel or pulley 36, which is connected by a suitable belt 37 with a source of power, such for instance as a motor 63. There is a belt 37 for each of the door operating means, these belts 37 all being operated from the same-source of power, which power in the present instance is transmitted through the medium of a pulley wheel 64 and belt leading to a pulley mounted on one of the shafts 61 hereinafter described.

Located between the two bevel gears 33 and 34 is a clutch mechanism 39 controlled by a suitable clutch shifter 40 connected with a suitable lever system 41 so mounted that the operating handle 42 thereof is in such position at the side of the apparatus that it can be readily manipulated by the operator, so that on shifting the lever 42 the shiftable member 4C3 of the clutch mechanism, and whichmember is splined or keyed to the till shaft 35 for sliding movement and ferrotation with the shaft, will be thrown into engagement with one or the other of the members of the clutch which are fixed to and rotate with the bevel gears 83 and 34, thereby to either raise or lower the door in a manner which will be readily understood.

For. the purpose of disconnecting the clutch member at the proper time, after the clutch 40 has by means of the lever 42 been shifted into connection with the bevel gear which is effective to rotate the cable drum in one direction to raise the door, a

suitable automatic means for operatingthe clutch shifter is provided. This-consists in the present instance of a sliding member or; bar. 44, which bar is" provided with a slot 45 at one end, through which the shaft 29 up the-proper bevel gear, as 34, the stop 49,00mes into contact with the arm or projection 47 of the bar 44 and shifts the bar 44 in one direction and thereby operates the 'clutch shifter 40 to move it and the movable clutch member away from the particular fixed clutch member with which it was engaged, .thus permitting the driving mecha- IHSIH to rotate without further raising of the door; When it is desired to lower the door, the lever 42 is' manipulated, and through the medium of the clutch shifter 40 the sliding clutch member) which, as hereinbefore stated, is splined to the shaft 35, is shifted into, engagement with the opposite bevel gear 33, whereupon the worm is rotated in the opposite direction and the drum rotatedvto lower the door.- Whenthe door Y has been completely lowered, the stud 49 is brought int ,position to contact. with the projection 4 in such position thatit will the clutch and thus means to door.

.For shifting the tray carrier or carrier chamber from one-of the compartments or jrway from the bevel gear 33 iscon'nect the doom operating chambers to theiother bf the eductor, suit-- able means is provided. In the present improvement each tray carrier is provided at its underside with arack 50 of substantially the length of the carrier, this rack being located preferably centrally between tlre 5 sides of the-carrier to extend lengthwise thereof' and to project beyond one, ias the front, end of the carrier. This enab esvthe carrier to be :0mp1etely shifted from one tain such chambers air-tight.

prevent further movement of the projects either above its platform in the front and rear of the eductor or through a slot 52 in the bottom of the several chambers 2, 3 and 4 to engage the rack 50. This slot 52 of each chamber is closed by the means hereinafter described so as to main- This rotating shaft 54 has a pulley wheel 58 connected by-abelt 59 with another pulley wheel 60 mounted on a shaft 6]., on which shaft thereis also mounted a belt pulley 62 connected. with asuitable. source of power, as for instance the motor 63, which constitutes the source of power for raising and lowering the doors as well as for shifting the carriers. For connecting the gear 52 to the rotatlng shaft "54 a clutch is used, one .member, as

, 70, being carried by the gear 52 and the other, as 71, keyed or splined to the shaft 54 and therefore rotating therewith. A clutch shifter 72 straddles the clutch member 71 and is connected to a sliding rod 73 linked to an operating handle 74. The manipulation of this handle 74 will engage or disengage the clutch members. When such members are engaged the gear 52 will be rotated with the shaft, and s0 shift the tray carrier, which when shifted into the proper position in a chamber will have the forward end of its rack pass'from its shifting gear 52.

In practice when the carrier is brought by its truck in front of the first chamber, the lever 74 adjacent to that chamberjs manipulated, whereupon the gear 52 in mesh with the rear end of the rack of the tray ;carrier will be rotated, and thereupon shift automatically shift the movablamember of mechanism similar to that just described from the eduction chamber 2 to the cooling chamber 4 a the door 6 lowered. The door 5 is then raised and the carrier in chamber 3, by its rack shifting mechanism, then shifted into the eduction chamber 2 and the doorfi lowered, whereupon another carried by a M Since the cduction chamber,

"incense ratus is a truck track for the tray carrierside of the truck 79, (see Fig. 3), andto one for lifting platform is a suitable crane 81 and separating the trays This crane runs upon a suitable track 82 and is provided with worm wheels 83 and 84 in mesh withright and left hand worms 85 shaft 86. On one end of the shaft is a sprocket or chain wheel 87 for a hand chain 88. Carried by each of the worm wheels 83 is a depending chain 89 having hooks 90, such hooks adapted to en gage with pro3ecting loops or rings in the ends of the trays. When the trays have been properly loaded they are carried by the crane into position to be received. by the tray carrier, which is mounted upon a truck movable upon the track 80. The trays carried by the crane in the manner described are conveyed lengthwise into the carrier above the tray supporting flanges, and to permit this the detachable brace bars are removed. When they are in their proper position in the carrier the chain is manipulated to slightly lower the trays, whereupon they are brought into position to be supported upon the interior flanges 11 of the carrier, whereupon a further lowering of the chains 89 and the hooks 90 will release the trays from the crane and thereupon the crane can be removed. A similar means is provided for lifting the trays at the end of the chamber 4: for the purpose of dumping the trays with the coke or residual material therein.

For the purpose of shifting a carrier from the rear to the front of the apparatus, thereby to permit the carriers to be re-used, at one side of the apparatus 1 have shown the platform provided with suitable rollers 95, similar rollers 96 being located in front of the first chamber 3 to facilitate of the carrier into that chamber.

In practice a numberof these apparatus may be provided,-as shown by the dotted lines 100 in. Fig. 4:, which is intended to illustrate another system of chambers similar to that hereinbefore described, whereby any desired number of eductors may be In use at the same time, so that a 'certaln quantity of material may be treated per day.

, Communicating with the underside of the eduction chamber, is a conduit 101 which leads to a suitable fan or exhauster 102, which may be driven from any suitable source of power, such for instance as a motor 103. This c'onduitJOl, may have a drip outlet 101 emptying into a tank or tub 101",

(see Fig. 4) a This fan casing communicates with suitable condensers 200.

from, the carrier.

the shifting as well as the other chambersishonld be maintained air tight, and as the rack shifting gears are always in rachengaging position and therefore pro ect through the bottoms of the chambers some means must be provided to close the bottpm wall of each of these chain bars, For llhLS purpose each of the gears b2 and'lts clutch, (excepting of course the gear located in front of the preliminary heating chamber and inthe rear of the woling chamber) ,a is located in a tightly closed casing or box secured to the underside of the chamber walls the shafted and rod 7.3 only prqectmg therefrom at one side. The platform in front of the preliminary heating chamber, andat the rear of the coolin chamber are each, as hereinbcfore state provided with an opening for the projection of the gear 52, located respectively at the front and rear of these chambers, but as this opening is outside of the chamber no'boX is necessary at this point. "Otherwise the rack shifting mechanism for all of the chambers is the same.

In practice the outer, that is the front and rear, doors of the apparatus will, subsequent to each loading of the chambers in the manner hereinbefore described, be made air tight by the use of some suitable material, such as asbestos cement. i

Above each of the doors 5 and 6 of the eduction chamber is located a hood 120, which is entirely closed at its top and on all sides, except the bottom, with the exception of the necessary opening for the passage 0 the chain or cable connected to the door. These hoods prevent the egress of the heated air from the eduction chamber as well as the ingress of cold air thereinto and permit the raising of the door the required distance to permit the shifting of the tray carrier.

By means of the present apparatus it will be observed that a uniform temperature can be maintained throughout the height of the carrier in view of the fact that the flame from the gas jets will impinge upon the outside surfaces of the carrier at points along the lower portion of the sides thereof, thus heating the material on. the trays at those points where it has heretofore been impracticable to obtain a sufficient amount of heat to complete the eduction of the vplatile matter in the lower trays, Thus, the heat which is drawn up and over the top of the carrier and down through the trays is supplemented at the lower portion of the carrier by the heat which comes in contact with the carriers at this point owing to the location of the gas jets in the manner stated, so that the material in the lower trays is as efl'ectively' treated as is the material in the upper trays. y p The apparatus above described, when apthe comparatively low temperature at which the treatment is carried on, that is below red heat or incandescence, with practically no tar or gaseous products being thrown off,

no coking of the coal in the usual sense of that term taking place, and the residual coke difi'ers'from cokes as usually produced in and the heat currents pass up over the top of the side Walls of the .carrier and down through the trays.

In the present improvement certain gases passing to the, condensersQOO are incondensable, and these may be utilized for the purpose of providing the heat in the preliminary heating ,and eduction chambers, by

conveying such gases from the condensers to a tank 201, and connecting the gas pipes 203 .with such tank and thus utilizing these incondensable gases to supply heat for the extraction of the volatile oils.

In practice the bottom of the eduction chamber 2 will be provided with a low wall or partition to inclose the sides of the car: rier so aslto prevent the heated currents from being drawnunder the carrier instead of up through the fines and down through the carrier. These walls may have their upper edges bent overto overlapthe lower I outer flanges of the I-beams of the carrier.

6' theeombination of a prelim nary heating I claim as my invention: I 1. Inan apparatus of the class described,

chamber, a vapor extracting chamber and, a

cooling chamber adapted to. communicate one with another, heating means within the vapor extracting chamber but separated from the charge to be treated for educing oil therefrom, sliding doors for closing said chambers, and hoodsfor said sliding doors.

2. In an apparatus of the class described, the combination of a chamber having slid-- ing doors, power-driven means for raising and lowering said doors,-and manually controlled clutch-operating means for throwing into and out of operation'said power-driven means,

3. In an apparatus of the class described,-

the combination ofa chamber having sliding doors, ppwer-driven means for raising and lowering said doors, manually controlled clutch-operating means for throwing into andout of operationsaid power driven means, and a tray carrier shiftable within said chamber.

4. In an apparatus or the class described, the combination ofa chamber having sliding doors, power-driven means for raising and lowering said doors, manually controlled clutch-operating means for throw-' ing into and out of operation said powerdriven means, a tray carrier shii'table within said'chamber, and means for shifting said tray carrier. l i 5. In an apparatus of the class described, the combination of a preliminary heating chamber, a vapor extracting chamber and a cooling chamber adapted to communicate one with another, sliding doors for closing said chambers, hoods for said sliding doors; and power driven means for raising and lowering said doors.

6. In an apparatus of the class described,- the combination of a preliminary heating chamber, a vapor extracting chamber and a cooling chamber adapted to communicate one with another, sliding. doors for closing said chambers, hoods for said sliding doors,

power-driven means for raising and lowering said doors, and manuallylcontrolled clutch-operating means for throwin 'into and out of operation said powerriven means. v 7 In an apparatus of the class described, the combination of a preliminary heating chamber, a vapor extracting chamber and a cooling chamber adapted to communicate one with another, sliding doors for closing said chambers, hoods for said sliding doors, power-driven means-for raising and lowering said doors, manually controlled clutchoperating means for throwing into and out of operation? said. oWer-driven means, a tray carrier shiftablewithin said chambers, and means for shifting said tray carrier.

8. In an apparatus of the class described, the combination of a plurality of chambers, a sliding door for closing said chambers one from the other, a hood-for said sliding door,

power-driven means for raising and lowering said door, and manually controlled means for throwing into \and out of operation said power-driven means.

9, In an apparatus of the class described! the combination ofza plurality of chambers,

a a sliding door for closing said chambers one from the other, a hood for said sliding door,

power-driven means for raising and lowering said door, and manually controlled means for throwing into'and out of operation said power-driven means, said last means including clutch-operating -mechanism. I;

10. In an apparatus b if the class described, the combination of a plurality of chambers, heating means within one of said chambers but. separated from the charge to be treated for educing oil therefrom, means for separating one chamber from the other, a tray carrier, power-driven means for shifting the tray-carrier from one chamber to another, and power-driven means for controlling the operation of said chamber separating means.

11. In an apparatus of the class described,

the combination of a plurality of chambers,.

heating means within one of said chambers but separated from the charge to be treated for educing oil therefrom, a sliding door for closing one chamber from the other, powerdriven means for controlling the operation of said door, a tray carrier shiftable from one chamber to the other, and means also connected with said power-driven means for shifting said tray carrier from one chamber to the other.

12. In an apparatus of the class described,-

the combination of a preliminary heating chamber, a vapor extracting chamber and a cooling chamber adapted to communicate one with another, heatin means within the vapor extracting cham er but separated from the charge to be treated for educing oil'therefrom, sliding doors for closing said chambers, and power-driven means for raising and lowering said doors in sequence.

13. In an apparatus of the class described, the combination of a preliminary heating chamber, a vapor extracting chamber and a cooling chamber adapted to communicate one with another, sliding doors for closing said chambers, power-driven means for raising and lowering said doors in sequence, and manually-controlled clutch-operating means for throwing into and out of operation said power-driven means.

14. In an apparatus of the class described,

.the combination of a preliminary heating chamber, a vapor extracting chamber and a cooling chamber adapted to communicate one with another, sliding doors for closing I raising and lowering said doors in sequence, manually controlled clutch-operating means for throwing into and out of operation said power-driven means, a tray carrier shiftable from one chamber to another, and power-driven means for shifting said tray carrier.

'16. In an apparatus of the class described, the combination of a preliminary heating chamber, a vapor extracting chamber and a cooling chamber adapted to communicate one with another, sliding doors for closing said chambers, power-driven means for. ralsing and lowering said doors in sequence,

manually controlled clutch-operating means for throwing into and out of operation said power-driven means, a tray carrier shiftable from one chamber to another, and. powerdriven means for shifting said tray carrier and including rack and gear mechanism.

17. In an apparatus of the class described, the combination of a preliminary heating chamber, a vapor extracting chamber and a coolin chamber adapted to communicate one with another, sliding doors for closing said chambers, ower-driven means for raising and lowering said doors in sequence, manually controlled clutch-o crating means for throwing into and out 0 operation said power-driven means, a tray carrier shiftable from one chamber to another, and power driven means for shifting said tray carrier and including rack and gear mechanism, the rack being carried by the tray carrier.

18. In an apparatus of the class described, the combination of a preliminary heating chamber, Va or extracting chamber and a cooling cham er adapted to communicateone with another, sliding doors for closing said chambers, power-driven means for raising and lowering said doors in sequence, manually controlled clutch-operating means for throwing into and out ofoperation said power-driven means, a tray carrier shiftable from one chamber to another, power-driven means for shifting said tray carrier and including rack and gear mechanism, the rack, being carried by the tray carrier, and hoods for said sliding doors.

. Signed at Detroit, in the county of Wayneand State of Michigan, this 20th day of October, 1914.

JOHN DUNLAP SCOTT. Witnesses:

B. M. Susan,

L. PAMiLLOn GA'FFNEY. 

